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RDMA/rds: Remove FMR support for memory registration

Browse Source 
Use FRWR method for memory registration by default and remove the ancient
and unsafe FMR method.

Link: https://lore.kernel.org/r/3-v3-f58e6669d5d3+2cf-fmr_removal_jgg@mellanox.com
Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Max Gurtovoy 2020-05-28 16:45:45 -03:00 committed by Jason Gunthorpe
parent f273ad4f8d
commit 07549ee21c
8 changed files with 21 additions and 322 deletions
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2
net/rds/Makefile
View File

@ -7,7 +7,7 @@ rds-y := af_rds.o bind.o cong.o connection.o info.o message.o \
obj-$(CONFIG_RDS_RDMA) += rds_rdma.o
rds_rdma-y := rdma_transport.o \
ib.o ib_cm.o ib_recv.o ib_ring.o ib_send.o ib_stats.o \
ib_sysctl.o ib_rdma.o ib_fmr.o ib_frmr.o
ib_sysctl.o ib_rdma.o ib_frmr.o
obj-$(CONFIG_RDS_TCP) += rds_tcp.o

20
net/rds/ib.c
View File

@ -130,13 +130,16 @@ void rds_ib_dev_put(struct rds_ib_device *rds_ibdev)
static int rds_ib_add_one(struct ib_device *device)
{
struct rds_ib_device *rds_ibdev;
bool has_fr, has_fmr;
int ret;
/* Only handle IB (no iWARP) devices */
if (device->node_type != RDMA_NODE_IB_CA)
return -EOPNOTSUPP;
/* Device must support FRWR */
if (!(device->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS))
return -EOPNOTSUPP;
rds_ibdev = kzalloc_node(sizeof(struct rds_ib_device), GFP_KERNEL,
ibdev_to_node(device));
if (!rds_ibdev)
@ -152,11 +155,6 @@ static int rds_ib_add_one(struct ib_device *device)
rds_ibdev->max_wrs = device->attrs.max_qp_wr;
rds_ibdev->max_sge = min(device->attrs.max_send_sge, RDS_IB_MAX_SGE);
has_fr = (device->attrs.device_cap_flags &
IB_DEVICE_MEM_MGT_EXTENSIONS);
has_fmr = (device->ops.alloc_fmr && device->ops.dealloc_fmr &&
device->ops.map_phys_fmr && device->ops.unmap_fmr);
rds_ibdev->use_fastreg = (has_fr && !has_fmr);
rds_ibdev->odp_capable =
!!(device->attrs.device_cap_flags &
IB_DEVICE_ON_DEMAND_PAGING) &&
@ -165,7 +163,6 @@ static int rds_ib_add_one(struct ib_device *device)
!!(device->attrs.odp_caps.per_transport_caps.rc_odp_caps &
IB_ODP_SUPPORT_READ);
rds_ibdev->fmr_max_remaps = device->attrs.max_map_per_fmr?: 32;
rds_ibdev->max_1m_mrs = device->attrs.max_mr ?
min_t(unsigned int, (device->attrs.max_mr / 2),
rds_ib_mr_1m_pool_size) : rds_ib_mr_1m_pool_size;
@ -219,14 +216,11 @@ static int rds_ib_add_one(struct ib_device *device)
goto put_dev;
}
rdsdebug("RDS/IB: max_mr = %d, max_wrs = %d, max_sge = %d, fmr_max_remaps = %d, max_1m_mrs = %d, max_8k_mrs = %d\n",
rdsdebug("RDS/IB: max_mr = %d, max_wrs = %d, max_sge = %d, max_1m_mrs = %d, max_8k_mrs = %d\n",
device->attrs.max_fmr, rds_ibdev->max_wrs, rds_ibdev->max_sge,
rds_ibdev->fmr_max_remaps, rds_ibdev->max_1m_mrs,
rds_ibdev->max_8k_mrs);
rds_ibdev->max_1m_mrs, rds_ibdev->max_8k_mrs);
pr_info("RDS/IB: %s: %s supported and preferred\n",
device->name,
rds_ibdev->use_fastreg ? "FRMR" : "FMR");
pr_info("RDS/IB: %s: added\n", device->name);
down_write(&rds_ib_devices_lock);
list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices);

2
net/rds/ib.h
View File

@ -247,13 +247,11 @@ struct rds_ib_device {
struct ib_device *dev;
struct ib_pd *pd;
struct dma_pool *rid_hdrs_pool; /* RDS headers DMA pool */
u8 use_fastreg:1;
u8 odp_capable:1;
unsigned int max_mrs;
struct rds_ib_mr_pool *mr_1m_pool;
struct rds_ib_mr_pool *mr_8k_pool;
unsigned int fmr_max_remaps;
unsigned int max_8k_mrs;
unsigned int max_1m_mrs;
int max_sge;

4
net/rds/ib_cm.c
View File

@ -527,10 +527,10 @@ static int rds_ib_setup_qp(struct rds_connection *conn)
return -EOPNOTSUPP;
/* The fr_queue_space is currently set to 512, to add extra space on
* completion queue and send queue. This extra space is used for FRMR
* completion queue and send queue. This extra space is used for FRWR
* registration and invalidation work requests
*/
fr_queue_space = (rds_ibdev->use_fastreg ? RDS_IB_DEFAULT_FR_WR : 0);
fr_queue_space = RDS_IB_DEFAULT_FR_WR;
/* add the conn now so that connection establishment has the dev */
rds_ib_add_conn(rds_ibdev, conn);

269
net/rds/ib_fmr.c
View File

@ -1,269 +0,0 @@
/*
* Copyright (c) 2016 Oracle. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "ib_mr.h"
struct rds_ib_mr *rds_ib_alloc_fmr(struct rds_ib_device *rds_ibdev, int npages)
{
struct rds_ib_mr_pool *pool;
struct rds_ib_mr *ibmr = NULL;
struct rds_ib_fmr *fmr;
int err = 0;
if (npages <= RDS_MR_8K_MSG_SIZE)
pool = rds_ibdev->mr_8k_pool;
else
pool = rds_ibdev->mr_1m_pool;
if (atomic_read(&pool->dirty_count) >= pool->max_items / 10)
queue_delayed_work(rds_ib_mr_wq, &pool->flush_worker, 10);
/* Switch pools if one of the pool is reaching upper limit */
if (atomic_read(&pool->dirty_count) >= pool->max_items * 9 / 10) {
if (pool->pool_type == RDS_IB_MR_8K_POOL)
pool = rds_ibdev->mr_1m_pool;
else
pool = rds_ibdev->mr_8k_pool;
}
ibmr = rds_ib_try_reuse_ibmr(pool);
if (ibmr)
return ibmr;
ibmr = kzalloc_node(sizeof(*ibmr), GFP_KERNEL,
rdsibdev_to_node(rds_ibdev));
if (!ibmr) {
err = -ENOMEM;
goto out_no_cigar;
}
fmr = &ibmr->u.fmr;
fmr->fmr = ib_alloc_fmr(rds_ibdev->pd,
(IB_ACCESS_LOCAL_WRITE |
IB_ACCESS_REMOTE_READ |
IB_ACCESS_REMOTE_WRITE |
IB_ACCESS_REMOTE_ATOMIC),
&pool->fmr_attr);
if (IS_ERR(fmr->fmr)) {
err = PTR_ERR(fmr->fmr);
fmr->fmr = NULL;
pr_warn("RDS/IB: %s failed (err=%d)\n", __func__, err);
goto out_no_cigar;
}
ibmr->pool = pool;
if (pool->pool_type == RDS_IB_MR_8K_POOL)
rds_ib_stats_inc(s_ib_rdma_mr_8k_alloc);
else
rds_ib_stats_inc(s_ib_rdma_mr_1m_alloc);
return ibmr;
out_no_cigar:
kfree(ibmr);
atomic_dec(&pool->item_count);
return ERR_PTR(err);
}
static int rds_ib_map_fmr(struct rds_ib_device *rds_ibdev,
struct rds_ib_mr *ibmr, struct scatterlist *sg,
unsigned int nents)
{
struct ib_device *dev = rds_ibdev->dev;
struct rds_ib_fmr *fmr = &ibmr->u.fmr;
struct scatterlist *scat = sg;
u64 io_addr = 0;
u64 *dma_pages;
u32 len;
int page_cnt, sg_dma_len;
int i, j;
int ret;
sg_dma_len = ib_dma_map_sg(dev, sg, nents, DMA_BIDIRECTIONAL);
if (unlikely(!sg_dma_len)) {
pr_warn("RDS/IB: %s failed!\n", __func__);
return -EBUSY;
}
len = 0;
page_cnt = 0;
for (i = 0; i < sg_dma_len; ++i) {
unsigned int dma_len = sg_dma_len(&scat[i]);
u64 dma_addr = sg_dma_address(&scat[i]);
if (dma_addr & ~PAGE_MASK) {
if (i > 0) {
ib_dma_unmap_sg(dev, sg, nents,
DMA_BIDIRECTIONAL);
return -EINVAL;
} else {
++page_cnt;
}
}
if ((dma_addr + dma_len) & ~PAGE_MASK) {
if (i < sg_dma_len - 1) {
ib_dma_unmap_sg(dev, sg, nents,
DMA_BIDIRECTIONAL);
return -EINVAL;
} else {
++page_cnt;
}
}
len += dma_len;
}
page_cnt += len >> PAGE_SHIFT;
if (page_cnt > ibmr->pool->fmr_attr.max_pages) {
ib_dma_unmap_sg(dev, sg, nents, DMA_BIDIRECTIONAL);
return -EINVAL;
}
dma_pages = kmalloc_array_node(sizeof(u64), page_cnt, GFP_ATOMIC,
rdsibdev_to_node(rds_ibdev));
if (!dma_pages) {
ib_dma_unmap_sg(dev, sg, nents, DMA_BIDIRECTIONAL);
return -ENOMEM;
}
page_cnt = 0;
for (i = 0; i < sg_dma_len; ++i) {
unsigned int dma_len = sg_dma_len(&scat[i]);
u64 dma_addr = sg_dma_address(&scat[i]);
for (j = 0; j < dma_len; j += PAGE_SIZE)
dma_pages[page_cnt++] =
(dma_addr & PAGE_MASK) + j;
}
ret = ib_map_phys_fmr(fmr->fmr, dma_pages, page_cnt, io_addr);
if (ret) {
ib_dma_unmap_sg(dev, sg, nents, DMA_BIDIRECTIONAL);
goto out;
}
/* Success - we successfully remapped the MR, so we can
* safely tear down the old mapping.
*/
rds_ib_teardown_mr(ibmr);
ibmr->sg = scat;
ibmr->sg_len = nents;
ibmr->sg_dma_len = sg_dma_len;
ibmr->remap_count++;
if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL)
rds_ib_stats_inc(s_ib_rdma_mr_8k_used);
else
rds_ib_stats_inc(s_ib_rdma_mr_1m_used);
ret = 0;
out:
kfree(dma_pages);
return ret;
}
struct rds_ib_mr *rds_ib_reg_fmr(struct rds_ib_device *rds_ibdev,
struct scatterlist *sg,
unsigned long nents,
u32 *key)
{
struct rds_ib_mr *ibmr = NULL;
struct rds_ib_fmr *fmr;
int ret;
ibmr = rds_ib_alloc_fmr(rds_ibdev, nents);
if (IS_ERR(ibmr))
return ibmr;
ibmr->device = rds_ibdev;
fmr = &ibmr->u.fmr;
ret = rds_ib_map_fmr(rds_ibdev, ibmr, sg, nents);
if (ret == 0)
*key = fmr->fmr->rkey;
else
rds_ib_free_mr(ibmr, 0);
return ibmr;
}
void rds_ib_unreg_fmr(struct list_head *list, unsigned int *nfreed,
unsigned long *unpinned, unsigned int goal)
{
struct rds_ib_mr *ibmr, *next;
struct rds_ib_fmr *fmr;
LIST_HEAD(fmr_list);
int ret = 0;
unsigned int freed = *nfreed;
/* String all ib_mr's onto one list and hand them to ib_unmap_fmr */
list_for_each_entry(ibmr, list, unmap_list) {
fmr = &ibmr->u.fmr;
list_add(&fmr->fmr->list, &fmr_list);
}
ret = ib_unmap_fmr(&fmr_list);
if (ret)
pr_warn("RDS/IB: FMR invalidation failed (err=%d)\n", ret);
/* Now we can destroy the DMA mapping and unpin any pages */
list_for_each_entry_safe(ibmr, next, list, unmap_list) {
fmr = &ibmr->u.fmr;
*unpinned += ibmr->sg_len;
__rds_ib_teardown_mr(ibmr);
if (freed < goal ||
ibmr->remap_count >= ibmr->pool->fmr_attr.max_maps) {
if (ibmr->pool->pool_type == RDS_IB_MR_8K_POOL)
rds_ib_stats_inc(s_ib_rdma_mr_8k_free);
else
rds_ib_stats_inc(s_ib_rdma_mr_1m_free);
list_del(&ibmr->unmap_list);
ib_dealloc_fmr(fmr->fmr);
kfree(ibmr);
freed++;
}
}
*nfreed = freed;
}
void rds_ib_free_fmr_list(struct rds_ib_mr *ibmr)
{
struct rds_ib_mr_pool *pool = ibmr->pool;
if (ibmr->remap_count >= pool->fmr_attr.max_maps)
llist_add(&ibmr->llnode, &pool->drop_list);
else
llist_add(&ibmr->llnode, &pool->free_list);
}

4
net/rds/ib_frmr.c
View File

@ -76,7 +76,7 @@ static struct rds_ib_mr *rds_ib_alloc_frmr(struct rds_ib_device *rds_ibdev,
frmr = &ibmr->u.frmr;
frmr->mr = ib_alloc_mr(rds_ibdev->pd, IB_MR_TYPE_MEM_REG,
pool->fmr_attr.max_pages);
pool->max_pages);
if (IS_ERR(frmr->mr)) {
pr_warn("RDS/IB: %s failed to allocate MR", __func__);
err = PTR_ERR(frmr->mr);
@ -240,7 +240,7 @@ static int rds_ib_map_frmr(struct rds_ib_device *rds_ibdev,
}
frmr->dma_npages += len >> PAGE_SHIFT;
if (frmr->dma_npages > ibmr->pool->fmr_attr.max_pages) {
if (frmr->dma_npages > ibmr->pool->max_pages) {
ret = -EMSGSIZE;
goto out_unmap;
}

14
net/rds/ib_mr.h
View File

@ -43,10 +43,6 @@
#define RDS_MR_8K_SCALE (256 / (RDS_MR_8K_MSG_SIZE + 1))
#define RDS_MR_8K_POOL_SIZE (RDS_MR_8K_SCALE * (8192 / 2))
struct rds_ib_fmr {
struct ib_fmr *fmr;
};
enum rds_ib_fr_state {
FRMR_IS_FREE, /* mr invalidated & ready for use */
FRMR_IS_INUSE, /* mr is in use or used & can be invalidated */
@ -84,7 +80,6 @@ struct rds_ib_mr {
u8 odp:1;
union {
struct rds_ib_fmr fmr;
struct rds_ib_frmr frmr;
struct ib_mr *mr;
} u;
@ -109,8 +104,7 @@ struct rds_ib_mr_pool {
unsigned long max_items;
unsigned long max_items_soft;
unsigned long max_free_pinned;
struct ib_fmr_attr fmr_attr;
bool use_fastreg;
unsigned int max_pages;
};
extern struct workqueue_struct *rds_ib_mr_wq;
@ -136,15 +130,9 @@ u32 rds_ib_get_lkey(void *trans_private);
void __rds_ib_teardown_mr(struct rds_ib_mr *);
void rds_ib_teardown_mr(struct rds_ib_mr *);
struct rds_ib_mr *rds_ib_alloc_fmr(struct rds_ib_device *, int);
struct rds_ib_mr *rds_ib_reuse_mr(struct rds_ib_mr_pool *);
int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *, int, struct rds_ib_mr **);
struct rds_ib_mr *rds_ib_reg_fmr(struct rds_ib_device *, struct scatterlist *,
unsigned long, u32 *);
struct rds_ib_mr *rds_ib_try_reuse_ibmr(struct rds_ib_mr_pool *);
void rds_ib_unreg_fmr(struct list_head *, unsigned int *,
unsigned long *, unsigned int);
void rds_ib_free_fmr_list(struct rds_ib_mr *);
struct rds_ib_mr *rds_ib_reg_frmr(struct rds_ib_device *rds_ibdev,
struct rds_ib_connection *ic,
struct scatterlist *sg,

28
net/rds/ib_rdma.c
View File

@ -181,7 +181,7 @@ void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_co
struct rds_ib_mr_pool *pool_1m = rds_ibdev->mr_1m_pool;
iinfo->rdma_mr_max = pool_1m->max_items;
iinfo->rdma_mr_size = pool_1m->fmr_attr.max_pages;
iinfo->rdma_mr_size = pool_1m->max_pages;
}
#if IS_ENABLED(CONFIG_IPV6)
@ -191,7 +191,7 @@ void rds6_ib_get_mr_info(struct rds_ib_device *rds_ibdev,
struct rds_ib_mr_pool *pool_1m = rds_ibdev->mr_1m_pool;
iinfo6->rdma_mr_max = pool_1m->max_items;
iinfo6->rdma_mr_size = pool_1m->fmr_attr.max_pages;
iinfo6->rdma_mr_size = pool_1m->max_pages;
}
#endif
@ -406,10 +406,7 @@ int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool,
if (list_empty(&unmap_list))
goto out;
if (pool->use_fastreg)
rds_ib_unreg_frmr(&unmap_list, &nfreed, &unpinned, free_goal);
else
rds_ib_unreg_fmr(&unmap_list, &nfreed, &unpinned, free_goal);
rds_ib_unreg_frmr(&unmap_list, &nfreed, &unpinned, free_goal);
if (!list_empty(&unmap_list)) {
unsigned long flags;
@ -503,10 +500,7 @@ void rds_ib_free_mr(void *trans_private, int invalidate)
}
/* Return it to the pool's free list */
if (rds_ibdev->use_fastreg)
rds_ib_free_frmr_list(ibmr);
else
rds_ib_free_fmr_list(ibmr);
rds_ib_free_frmr_list(ibmr);
atomic_add(ibmr->sg_len, &pool->free_pinned);
atomic_inc(&pool->dirty_count);
@ -622,10 +616,7 @@ void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
goto out;
}
if (rds_ibdev->use_fastreg)
ibmr = rds_ib_reg_frmr(rds_ibdev, ic, sg, nents, key_ret);
else
ibmr = rds_ib_reg_fmr(rds_ibdev, sg, nents, key_ret);
ibmr = rds_ib_reg_frmr(rds_ibdev, ic, sg, nents, key_ret);
if (IS_ERR(ibmr)) {
ret = PTR_ERR(ibmr);
pr_warn("RDS/IB: rds_ib_get_mr failed (errno=%d)\n", ret);
@ -669,19 +660,16 @@ struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *rds_ibdev,
if (pool_type == RDS_IB_MR_1M_POOL) {
/* +1 allows for unaligned MRs */
pool->fmr_attr.max_pages = RDS_MR_1M_MSG_SIZE + 1;
pool->max_pages = RDS_MR_1M_MSG_SIZE + 1;
pool->max_items = rds_ibdev->max_1m_mrs;
} else {
/* pool_type == RDS_IB_MR_8K_POOL */
pool->fmr_attr.max_pages = RDS_MR_8K_MSG_SIZE + 1;
pool->max_pages = RDS_MR_8K_MSG_SIZE + 1;
pool->max_items = rds_ibdev->max_8k_mrs;
}
pool->max_free_pinned = pool->max_items * pool->fmr_attr.max_pages / 4;
pool->fmr_attr.max_maps = rds_ibdev->fmr_max_remaps;
pool->fmr_attr.page_shift = PAGE_SHIFT;
pool->max_free_pinned = pool->max_items * pool->max_pages / 4;
pool->max_items_soft = rds_ibdev->max_mrs * 3 / 4;
pool->use_fastreg = rds_ibdev->use_fastreg;
return pool;
}